<template>
	<view>
    <!-- 使用自定义搜索组件 -->
     <my-search @click='gotoSearch'></my-search>
		<view class="scroll-view-container">
		  <!-- 左侧的滑动区 -->
      <scroll-view scroll-y="true"  :style="{height:wh + 'px'}" class="left-scroll-view">
        <block v-for="(item,i) in cateList" :key='i'>
          <view :class="['left-scroll-view-item' , i === active ? 'active' : ' ']" @click="activeChanged(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧的滑动区 -->
      <scroll-view scroll-y="true"  :style="{height:wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key='i2'>
          <!-- 二级分类标题 -->
          <view class="cate-lv2-title">
            / {{item2.cat_name}} /
          </view>
          <!-- 当前二级分类下的三级分类 -->
          <view class="cate-lv3-list">
            <!-- 三级分类的item项 -->
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key='i3' @click="gotoGoodsList(item3)">
              <!-- 三级分类的图片 -->
              <image :src="item3.cat_icon"></image>
              <!-- 三级分类的文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
		</view>
	</view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
    mixins:[badgeMix],
		data() {
			return {
        scrollTop:0,
        active:0,
				// 当前设备可用高度
        wh:0,
        // 分类列表
        cateList:[],
        // 二级分类列表
        cateLevel2:[]
			};
		},
    onLoad(){
      // 拿到屏幕可用高度
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      
      // 拿到分类列表数据
      this.getCateList()
      
      
    },
    
    methods:{
      // 获取分类列表的数据
      async  getCateList(){
        const {data : res} =  await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        
        // 为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      
      // 点击切换索引
      activeChanged(i){
        this.active = i
        
        // 重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      
      // 点击切换到商品详情
      gotoGoodsList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      
      // 点击搜索切换到搜索页面
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    },
    
    
	}
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  
  .left-scroll-view{
    width: 120px;
    .left-scroll-view-item{
      background-color: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;

      &.active{
        background-color: #ffffff;
        position: relative;
 
        &::before{
          content: ' ';
          display: blok;
          width: 3px;
          height: 30px; 
          background-color: red;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
          }
      }
    }
  }
}

.cate-lv2-title{
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}

.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item{
    width: 33.33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
    image{
      width: 60px;
      height: 60px;
    }
    text{
      font-size: 12px;
    }
  }
}
</style>
